Observations
When we add Yeast powder to Glucose, in a desirable temperature, there is a presence of a gas, which is tested by limewater
- Amount of carbon dioxide produced can be measured by the height
- Temperature and time has to be kept constant
Why did the yeast "foam" when we added Glucose?
- We heated it
Yeast -> bread
- Bakers add Flour and Sugar
Reactions
- Blue Methylene blue is reduced to a colourless methlene blue
- Live Yeast decolourised (Does not allow methlene blue to enter?)
- Boiled Yeast stays methlene blue
- Oxidation means losing electrons
- Reduction means gaining electrons
Shaking genlty helps to break down one grain of yeast into granules of yeast
- Helps them get glucose and respire
Conclusion
- Only live yeast can be used to show oxidation and reduction
- All yeast cells have methlene blue diffusing into them, but it will be decolourised by a reduction process in the live yeast cell
- Methlene blue must have entered the cell for the cells to react and lose electrons to the methlene blue, a reduction process, which decolourises it.
Yeast Experiment
Observations
When we add Yeast powder to Glucose, in a desirable temperature, there is a presence of a gas, which is tested by limewater
- Amount of carbon dioxide produced can be measured by the height
- Temperature and time has to be kept constant
Why did the yeast "foam" when we added Glucose?
- We heated it
Yeast -> bread
- Bakers add Flour and Sugar
Reactions
- Blue Methylene blue is reduced to a colourless methlene blue
- Live Yeast decolourised (Does not allow methlene blue to enter?)
- Boiled Yeast stays methlene blue
- Oxidation means losing electrons
- Reduction means gaining electrons
Shaking genlty helps to break down one grain of yeast into granules of yeast
- Helps them get glucose and respire
Conclusion
- Only live yeast can be used to show oxidation and reduction
- All yeast cells have methlene blue diffusing into them, but it will be decolourised by a reduction process in the live yeast cell
- Methlene blue must have entered the cell for the cells to react and lose electrons to the methlene blue, a reduction process, which decolourises it.